Sancho III of Castile

Sancho III "the Desired" of Castile (1134-31 August 1158) was King of Castile from 21 August 1157 to 31 August 1158, succeeding Alfonso VII of Castile and preceding Alfonso VIII of Castile.

Biography
Sancho was born in 1134, the eldest son of King Alfonso VII of Castile and Berengaria of Barcelona. He was nicknamed "the Desired" because he came to his parents after eight years of inability to have a son, and Sancho inherited Castile and Toledo from his father, while his brother Fernando inherited Leon. The two brothers signed a treaty in the summer of 1158, but Sancho suddenly died on 31 August 1158 of unknown causes.